Improvement in ventilators



@geiten tstr stmt l@fitta Letters Patent N. 76,717, dated April 14, 1868.

IMPROVEMENT 1N vsNrILAroRs.

litt Scintille referat to it tlp'st ttltits ntcnt :nu uniting @ttt ni tigev sume.

TO ALL WHOM IT MAY CONCERN: n Ai-Beit k'riithat I, RICHARD T. CRANE, of Chicago, Illinois, have invented certain new and useful Improvements in the Mode of Heating vand Ventilating Buildings; and I do declare that the following is a full, clear,

und exact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, in which-' Figure 1 is a transverse` section.

Figure 2, a front view.

Figure 3, a top view.. l- Y It is well known'that pure air is essential to health. Hitherto no adequate means of ventilation` has been provided for buildings heated by hot air; the supply of pure air being cut .off as the hot-air register is closed.

The nature and object of my invention consists in providing a constant supplyof pure air, whether the hotair pipe he opener closed. This I accomplish byA carrying into the building or room to be warmed a cold-air pipe, which receives its supply from the source which supplies cold air to be hea-ted, and providing theA hot-air pipe andcold-air pipe with a register or registers, so arranged and operated that'as fast as one pipe is closed the other will be ot necessity opened, so that as the hot-air pipe is closed, or partially closed, the cold-air pipe must be correspondingly opened, and th'e supply of pure air will be constant. My improvement may be used in any building warmed by the use of hot airMbut will be found especially useful in schools `and other public buildings. f y v To enable others skilled in the art to malte and use my invention, I proceed to describe its construction and operation. t l v Y,

As shown in the drawings, the' pipes are carried up in the wall or partition of the building, and the air introduced' through the side of the room, though, ii' desired, the pipes can be so arranged as to introduce the air through the door.

-D represents the wall or partition-walls. A is a hot-air pipe, constructed and arranged in the usual mam ner. B is a cold-air pipe, which I usually make of the saure size as the pipe A.v This pipe B is supplied with pure `cold air, and has no connection with the hot-air pipe. L h are projections, to which ,the'dctlectoa is pivoted, at the points-a a, in any convenient manner. C is a register. b is a rod, attadhed to the register at c, and to the deector at z'. i f Y.

In operation, when the register-'C is so adjusted aste wholly close thefpipe B, the pipe A will be wholly open, and the deflector E will he in the position indicated by the dotted lines' in iig. l. In this position no cold air will he admitted through B, and hot air passing out ofthe pipe A, at d, enters the room over the upper edge of the delector, ntf. If, from any cause, it becomes desirable to close'or partially close the pipe A, it can be done by changing theposition of tlc detlector; and, as the dcilector, E, is connected with the register by the rod b, itis manifest that as the pipe A is closed, the pipe B will be opened, so that the open space for the admission of air to the room will be constantly the same, the supply of cold air increasing as the supply of hot air;`

decreases. When the position of the register is such as to leave both pipes partly open, as shown in the draw, ings, cold air passes in from B, at c, and hot air at fl, and both passl into the room atfand g. When the hotuir pipe, A, is wholly closed, the pipe B will be entirely open, and the opening-will be` closed by the deflector; cold air only will then be admitted through g.

v It is obvious, that when this device is used, the supply of pure air does not depend on the will of the person in `charge of the room, that it cannot he 'cut oli` by mistake, and'that such supply must be constant.

I do not confine myself tothe manner of operating the register above described, nor to the use of a ysliding register. `The deilector may be dispensed with, und registers of various forms, and any convenient mode of operating the same, may be used. Neither is it necessary that the two pipes A and B enter the roomat the same point, though it will usually be most convenient so to arrange them. For convenience, the drawings show the space above the pipesAB open at the top, though in use it will be closed. The pipes A B may be each provided with a register independently operated, and the object of luy-invention thus attained, though not with the samecertainty as by the method described.I

I am aware that delectors have been heretofore used, but not centrally supported. Having thus fully described myinvention, what I claim as new, and desire to secure by Letters Patent, i s- 1. The cold-airpipe B, in combination with the hot-air pipe A, substantiallyas and for tbe purposes speeied, 2. The 'air-pipe B, in combination with the pipe A and register C, substantially as and for the purposes specied. l

3. Providing the hot and cold-air ues A B with a register, so constructed and operated that when one flue is closed, or partially closed, the other will be correspondingly opened,`substantally as and for the purposes specified.

l4. The deector E, in combination with the register C, constructed and operating substantially as and for the purposes speeied.

5. The deflector E, constructed and operating substantially as and for the purposes specified.

RICHARD T. CRANE.

Witnesses:

EUGENE P. Mense, E. A. WEsT. 

